Climate Control Intermittent Cabin Heat - Second Generation Climate Control Applies to late 123 and 107 chassis and all 126 chassis 1981 to 1991
Climate Control Intermittent or No Cabin Heat - First Generation Climate Control No heat or heat all the time are common problems with 1977 to 1980 models with automatic controls
Climate Control Heater Blower Motor Won't Run A common problem on all models. Options for repairing it yourself and saving big $$$.
Climate Control Location and Replacement of Cabin Air Fitlers These really get neglected and they are easy DIY